Quick-detachable tire-valve dust cap



C.H. WOODBURY. QUICK DETAC'HABLE TIRE VALVE uusr CAP.

APPLICATION HLED JULY 18. 1919- Patented June 27, 1922;

Inventor,

OFFICE.

CHARLES HUGH WOODBURY, OFjLOS ANGELES, CALIFORNIA;

QUICK-DETACHABLE TIRE- VALVE DUST CAP.

Specification of Letters Patent.

Patented June 27, 1922.,

Application filed July 18, 1919. Serial No. 311,883,

To all whom it may concern:

Be it known that I, CHARLns HUGH Noonnonr, a citizen of the United States, and a resident of Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Improvement in Quick-Detachable Tire-Valve Dust Caps, of which the following is a specification.

This invention relates to tire valve dust caps and the principal object is to provide a dust cap that may be quickly removed and closely contacts with the inclined conical face of the securing nut for the valve and forms a perfect water tight and dust proof cover.

A further object of the invention is to pro vide the cap with knurled surface for gripping the same, the cap being preferably formed out sheet metal that will be light,

easy of manufacture and have suflicient elasticity to give spring action to the gripping margin.

In the drawing accompanying this spec1 fication Fig. 1 is an elevation of the cap and the valve nut shown with one of the two slits to allow the lower margin to slip over the conical extension of the nut.

Fig. is a plan view of the device and Fig. 3 is a central longitudinal section of the lower portion of the cap, with the nut and its truncated conical extension in elevation, the stemof the valve being shown in dotted lines.

My invention overcomes the above difficulties and forms an absolute seal to the entrance of dust or water that would tend to carry deposited dust into the chamber formed by the cap through the crevices usu ally found.

Calling attention particularly to the drawing, described above, the nut or lock usually found on a valve stem is shown as numbered of the usual hexagon form, the same be ing formed with a conical projection 6 extending outwardly from its contact with the wheel rim and being preferably truncated, as shown, with only a slight margin 7 extending beyond the outer diameter of the threads on the stem 8.

The projection is also grooved or machined to have a reverse conical surface 9 which forms the contacting portion of the gripping edges 10 of the cylindrical cap 11, adapted to embrace these conical portions of the nut.

flhe cap 11 as stated is preferably cylindrical and maybe drawn or spun out of re silient metal ofsuflicient thickness to form a light and graceful cover, the same being split from the gripping margin upward as shown in igs. 1 and 3 at 12 to a point, just below the annular groove or corrugation '14 formed in the cap, this groove being of such depth as to form a projection inwardly to contact with the conical surface 6 pist before the gripping margins reach the imit of their gripping action on the surface 9, so that there is a tendency to draw the inside surface of the groove 14 to a tight fit on its opposing surface to form a complete dust and water seal.

To form a good grip in removing or applying the cap the upper or outer portion of the same is preferably knurled as shown at 15, the whole being closed at the end by the top 16 either formed with or secured in other well known mechanical methods.

This cap will not rattle on the nut from wear as has occurred with other devices of this character, the same being of such a simple character that anyone may compress the inturned spring margin 10, should they bei come stretched and fail to draw the annular projection 14: in contact with the cone, the surface 9 being preferably formed of greater width than the part 10 to accommodate the slight wear that might take place, the cap seating with a snap that assures the operator that it is locked securely and properly performing the required functions.

Having thus described my invention, what I claim is:

The combination with a pneumatic tire valve stem nut having a frusto conical por tion projecting from the face thereof, said frusto conical portion having an annular groove at the junction of the conical portion and nut. of a substantially cylindrical dust cap having an inturned lower edge for detachably engaging said annular groove, and having an annular internal rib located at a distance from the said lower edge which is less than the height of the frusto conical portion whereby when said inturned edge is in. engagement with the groove the internal rib contacts with the surface of the frusto conical portion below the top thereof.

CHARLES HUGH WOODBU'RY. 

